It's posssible, but without the mask effect (mask can be added on top the shader from filter menu) and it should be used with benevolent settings to look OK (like auto integer scaling, that worked...).

Note: this shader is for WinUAE.

Edit: Faster version of CRT-Guest-Lo-Res (original version can cause slowdowns).

hyllian is working but it seems that it is too much for my MacMini i5 because the sound ist stuttering. even guest will not work. FS-UAE reports a compiling error and ignores the filter.
Do you have any hints for me? I really like to play games with the guest filter!